Walnut Creek police said 20-year-old Concord resident Shaina Mae Day, a 17-year-old male and a 16-year-old male were arrested during a warrant search Monday at a home in Concord.

According to Walnut Creek police Lt. Steve Gorski, Day and her two teenage accomplices are believed to be responsible for a robbery involving a Kaiser Permanente employee in the hospital's parking lot on Jan. 22 as well as the burglary of a Concord store in which several items, including lottery tickets, were stolen.

Police did not release the exact location of the store that was burglarized or what else was taken.

Day was booked into the County Jail in Martinez. The teenagers were booked into juvenile hall.